Some Earth-Moon NRHOs. From Williams et al, 2017. I have mentioned the Circular Restricted Three-Body Problem (CR3BP) here a couple of times. Another type of periodic CR3BP orbit is the "near rectilinear" halo orbit (NRHO). These orbits are just the continuation of the family of "normal" halo orbits until they …| Degenerate Conic
Modified Equinoctial Elements| degenerateconic.com
Gooding Universal Elements| degenerateconic.com